Empson, W. (1961). Seven types of ambiguity ([3rd ed.].). Penguin Books in association with Chatto and Windus.
芝加哥风格引文Empson, William. Seven Types of Ambiguity. [3rd ed.]. Harmondsworth, Middlesex: Penguin Books in association with Chatto and Windus, 1961.
MLA引文Empson, William. Seven Types of Ambiguity. [3rd ed.]. Penguin Books in association with Chatto and Windus, 1961.
警告：这些引文格式不一定是100％准确.